Remove old QAT APIs

[andrewor14]

(Re-opened to remove stack, identical to https://github.com/pytorch/ao/pull/3147)

Summary: As a follow-up to https://github.com/pytorch/ao/pull/2641, which deprecated the old QAT APIs in 0.13.0, we remove them now in the next release 0.15.0.

Fixes https://github.com/pytorch/ao/issues/2630.

Test Plan: CI

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/3310

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:white_check_mark: You can merge normally! (2 Unrelated Failures)

As of commit 036339cc29c49ba5426feedd6f2dfd114039cbbc with merge base a8fa9e554f5befc8a8f4db113028ea4b9c69e728 ():

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Run 1xH100 Tests / test (H100, linux.aws.h100, --pre torch torchvision torchaudio fbgemm-gpu-genai --index-url https... / linux-job (gh) (trunk failure) test/integration/test_load_and_run_checkpoint.py::TestLoadAndRunCheckpoint::test_deprecated_hf_models_model_info2
• Run Regression Tests / test-nightly (CUDA Nightly, linux.g5.12xlarge.nvidia.gpu, --pre torch --index-url https://downloa... / linux-job (gh) (trunk failure) test/test_low_bit_optim.py::TestFSDP2::test_fsdp2

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[meta-codesync[bot]]

@andrewor14 has imported this pull request. If you are a Meta employee, you can view this in D86543553.

[jerryzh168]

@andrewor14 are you planning to land this before next release?

[andrewor14]

are you planning to land this before next release?

I think this is blocked on some internal callsites that need to be migrated before we can land this. Probably won't make it in 0.15.0 but I think that's fine

[meta-codesync[bot]]

@andrewor14 has exported this pull request. If you are a Meta employee, you can view the originating Diff in D86543553.